bilsalak

// As a way to play with functions and loops, let's implement a square root function: given a number x, 
// we want to find the number z for which z² is most nearly x.
//
// Computers typically compute the square root of x using a loop. Starting with some guess z, 
// we can adjust z based on how close z² is to x, producing a better guess:
//
// z -= (z*z - x) / (2*z)
// Repeating this adjustment makes the guess better and better until we reach an answer that is as close 
// to the actual square root as can be.
//

bilsalak

// See https://gist.github.com/bilsalak/a6016b2e564418402b1431491040f372 for part 1
//
// Next, change the loop condition to stop once the value has stopped changing 
// (or only changes by a very small amount). See if that's more or fewer than 10 iterations.
package main

import (
	"fmt"
	"math"
)

bilsalak

// See https://gist.github.com/bilsalak/a53cddbee61647eea9de552193cfcedf for part 2
//
// Try other initial guesses for z, like x, or x/2. How close are your function's 
// results to the math.Sqrt in the standard library?
package main

import (
	"fmt"
	"math"
)

bilsalak

// Implement Pic. It should return a slice of length dy, each element of which is 
// a slice of dx 8-bit unsigned integers. When you run the program, it will display your picture, 
// interpreting the integers as grayscale (well, bluescale) values.
//
// The choice of image is up to you. Interesting functions include (x+y)/2, x*y, and x^y.
//
// (You need to use a loop to allocate each []uint8 inside the [][]uint8.)
//
// (Use uint8(intValue) to convert between types.)
package main

bilsalak

// Implement WordCount. It should return a map of the counts of each “word” in the string s. 
// The wc.Test function runs a test suite against the provided function and prints success or failure.
// 
// You might find strings.Fields helpful.
package main

import (
	"strings"

	"golang.org/x/tour/wc"

bilsalak

// Let's have some fun with functions.
// 
// Implement a fibonacci function that returns a function (a closure) that returns 
// successive fibonacci numbers (0, 1, 1, 2, 3, 5, ...).
package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.

bilsalak

// Make the IPAddr type implement fmt.Stringer to print the address as a dotted quad.
//
// For instance, IPAddr{1, 2, 3, 4} should print as "1.2.3.4".
package main

import (
	"fmt"
)

type IPAddr [4]byte

bilsalak

// Copy your Sqrt function from the earlier exercise and modify it to return an error value.
//
// Sqrt should return a non-nil error value when given a negative number, as it doesn't support complex numbers.
//
// Create a new type
//
// type ErrNegativeSqrt float64
//
// and make it an error by giving it a
//

bilsalak

// Implement a Reader type that emits an infinite stream of the ASCII character 'A'.
package main

import (
	"golang.org/x/tour/reader"
)

type MyReader struct{}

// TODO: Add a Read([]byte) (int, error) method to MyReader.